Polymer-assisted synthesis of metal nanoparticles: development of substrates for s...
| Grant number: | 13/01897-4 |
| Support type: | Scholarships in Brazil - Doctorate |
| Effective date (Start): | December 01, 2013 |
| Effective date (End): | January 31, 2018 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Condensed Matter Physics |
| Principal Investigator: | Carlos José Leopoldo Constantino |
| Grantee: | Sabrina Aléssio Camacho |
| Home Institution: | Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil |
| Associated scholarship(s): | 15/03143-2 - Tuning the core size and the silica shell of metallic nanoparticles for effectiveness surface-enhanced phenomena, BE.EP.DR |
Abstract In this PhD project nanostructured films of metalloporphyrin will be prepare using the spray-LbL (Layer-by-Layer) and Langmuir-Blodgett (LB) techniques, making possible to obtain films with different molecular architectures. Metallic nanoparticles of silver and gold (AgNPs and AuNPs) will be incorporated in the nanostructured films of metalloporphyrin using different methodologies. The aim is to evaluate the influence of these parameters (type of metallic nanoparticles and method of incorporation) on the surface-enhanced Raman and surface-enhanced resonance Raman scattering (SERS and SERRS) and surface-enhanced fluorescence (SEF) effects. The zinc(II) protoporphyrin IX dimethyl ester was chosen as the target molecule due to its high cross section for fluorescence and Raman effects and the possibility of fabricating spray-LbL and LB films. The nanoparticles will be synthesized with and without a coating-layer of silica. For nanoparticles uncoated, or with ultrathin coating-layer (<4 nm), SERS and SERRS effects are favored. As the thickness of the silica coating-layer increases, the SEF effect is privileged. In addition, the spray-LbL and LB film growth will be monitored by ultraviolet-visible absorption spectroscopy and quartz crystal microbalance. The morphology in micrometer scale will be determined by micro-Raman technique and in nanoscale by atomic force microscopy and scanning electron microscopy. The organization of the molecules in the films will be determined by infrared absorption spectroscopy combining transmission and reflection modes. We intend to contribute to the SERS, SERRS and SEF fields, applying them to systems such as nanostructured films/metallic nanoparticles, including preliminary tests on sensing devices to detect pesticides. | |